Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.


The Physics of the Death Star

How to destroy an Alderaan-sized planet.

“What’s that star?
It’s the Death Star.
What does it do?
It does Death. It does Death

The Limit Of What Hubble Can See

The most powerful telescope in history will never see the farthest galaxy.

“No distance of place or lapse of time can lessen the

Mostly Mute Monday: The Most Extreme View Into Deep Space

See as far back in the Universe as our greatest telescope’s eyes will take us.

“It is by going down into

Weekend Diversion: Disney’s Game of Thrones

If winter is coming, this epic artwork is the spring thaw.

“When I was a kid, my world was five streets long. I

Publications edited by Ethan Siegel

The Universe is out there, waiting for you to discover it.


Ask Ethan #86: The last light in the Universe

Can failed stars, or stellar corpses, give light to the Universe once again?

“A single tiny light creates a space

Throwback Thursday: The Physics of Happy Gilmore

Can a running start really improve your driving distance in golf?

“What a shot by Happy Gilmore! <aside> Who the

What Does “Scientific Consensus” Mean?

Should we get vaccinated? Fluoridate our water? Fight global warming? Believe in evolution? The Big Bang? Dark matter? Find out.


Bring Deep Space Home

Govert Schilling’s new book deserves a place in everyone’s life.

“Imagination will often carry us to worlds that never were. But without it

Mostly Mute Monday: NASA’s Greatest Observatories View The Galactic Center

With Hubble, Spitzer and Chandra combined, we get a view like no other.


Weekend Diversion: The Horrible Conditions of S’more Factory Farms

After seeing these pictures, you’ll switch to raising your own.

“People speak sometimes about

Ask Ethan #85: Hubble vs. The Big Bang

How do we know that the fluctuations in the cosmic microwave background aren’t polluted by everything Hubble reveals?